I find myself frequenting at certain places and usually stay occupied with the activity I'm there for. I do enjoy and frequent in interactions with other people however I can't exactly go up and talk to everyone I know

Sometimes, I do end up making eye-contact with different people, especially attractive females that I've talked to in the past and have no idea what to do with my body or my facial expressions. I frequent the places along with them so not exactly lost opportunities

I don't want to be rude. Is there anyway i can acknowledge them without feeling the need to converse with them about their day or whatever they are doing?